your expert advices and guidance on garment e-commerce website development

Dear Friends,
I want to start a e-commerce portal / website (B2C business to customer ) for my products (right now garments specially ladies-wear, but can further can be expanded on to more category or items too)
Therefore I needed your expert advices and guidance on , what to give in its various features to make it
1. User/ customer friendly
2. Administration friendly
3. SEO search engine optimization and automated SEO friendly
4. Profitable
I will be heartily thankful if you take your some time to give me your expert tips
Regards and thanks